You have a Microsoft Exchange Server 2013 organization and a Skype for Business Server 2015 infrastructure.
You need to design a Unified Messaging (UM) solution to meet the following requirements:
– Support a peak concurrency of 500 calls.
– Connect to two Skype for Business Sever 2015 pools.
What is the minimum number of mailbox servers that are required?
A . 1
B . 2
C . 3
D . 5
Answer: C